Package google.registry.tools

Class LevelDbLogReader

java.lang.Object

google.registry.tools.LevelDbLogReader

All Implemented Interfaces:

java.util.Iterator<byte[]>

public final class LevelDbLogReader
extends java.lang.Object
implements java.util.Iterator<byte[]>

Iterator that incrementally parses binary data in LevelDb format into records.

The input source is automatically closed when all data have been read.

There are several other implementations of this, none of which appeared suitable for our use case: The original C++ implementation. com.google.appengine.api.files.RecordReadChannel - Exactly what we need but deprecated. The referenced replacement: The App Engine GCS Client - Does not appear to have any support for working with LevelDB. *

See log_format.md

Method Summary

Modifier and Type	Method	Description
static LevelDbLogReader	from(java.io.InputStream source)	Returns a LevelDbLogReader over an InputStream.
static LevelDbLogReader	from(java.lang.String filename)	Returns a LevelDbLogReader over a file specified by filename.
static LevelDbLogReader	from(java.nio.channels.ReadableByteChannel channel)	Returns a LevelDbLogReader over a ReadableByteChannel.
static LevelDbLogReader	from(java.nio.file.Path path)	Returns a LevelDbLogReader over a file specified by Path.
boolean	hasNext()
byte[]	next()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.util.Iterator

forEachRemaining, remove

Method Detail

hasNext

public boolean hasNext()

Specified by:

hasNext in interface java.util.Iterator<byte[]>

next

public byte[] next()

Specified by:

next in interface java.util.Iterator<byte[]>

from

public static LevelDbLogReader from(java.nio.channels.ReadableByteChannel channel)

Returns a LevelDbLogReader over a ReadableByteChannel.

from

public static LevelDbLogReader from(java.io.InputStream source)

Returns a LevelDbLogReader over an InputStream.

from

public static LevelDbLogReader from(java.nio.file.Path path)
                             throws java.io.IOException

Returns a LevelDbLogReader over a file specified by Path.

Throws:

java.io.IOException

from

public static LevelDbLogReader from(java.lang.String filename)
                             throws java.io.IOException

Returns a LevelDbLogReader over a file specified by filename.

Throws:

java.io.IOException